Friction clutch-pulley



Patented NOV.V 15, 1898. w. J. FLETCHER.

rmcnou omen PULLEY.

Application filed Ms.y 7. 1897.

2 Sheets-Sheet 2.

(I!) Model.)

SsW.

NITED STATES WVILLIAM J. FLETCHER, OF ST. PAUL MINNESOTA, ASSIGNOR OF ON E-HALF TO THE ROBERTS GOSS COMPANY, OF MINNESOTA.

FRICTION CLUTCH-PULLEY.

SPEGIFIGATION forming part of Letters Patent 1\To. 614,264, dated November 1 5, 18980 Application filed May 7, 1897. Seri'al No. 635 489. (Na model) T0 aZZ wh0m it may concern:

Be t known that I, WILLIAM J. FLETCHER, of St. Paul, Ramsey county, Minnesota, have invented certain Improvements in Friction Clutch-Pulleys, of Which the folloWing is a specfication.

My invention relates to mprovements in friction clutch-pulleys; and it consists in the features of construction hereinafter particularly described and clain1ed.

In the accompanying drawings, forming part of this specification, Figure 1 is an end elevation of a pulley shown With my improved friction clutch attachment. Fig. 2 is a smilar view shown on line x 00 of Fig. 3. Fig. 3 is a partial central longitudinal sect-on, the raak-bars being shown in plan view; and Fig. 4 is a sectional detail taken on line y y of Fig. 2.

In the drawings, A represents the pnlley, which with its attachments constitutes the driven element, to the spokes 2 of which is bolted a ri1n er flange 3, concentric With the face of the pulley. The pulley has its hub 4; journaled loosely u pon the shaft 5, being held from movement in one direction by the collar 6, secured en the shaft by the set-screw 7, and held fr0m movement in the opposite direction by the hub 8 of the clutch mechanism B, secured upon the shaft by means of a key 9. Said clutch mechanism and its connected shaft.constitute the driving element.

Slidable upon the hub 8 and held from turning thereon by means of the feather 10 is the sleeve 11. The outer end of the hub 9 has an annular ring 12, secured thereon by screws 13, thus constituting a flange which serves as a stop t0 limit the movement of the sleeve 11. This sleeve is slpped aleng the hub 8 by means of the two-part collar 14, werking in a circumferential groove therein and operated by means of the yoke-shaped lever 15, havin g its fulcrum-pivot on the standard 16.

The sleeve 11 carries a fixed y0ke er collar 17, to the laterally-projeeting ends of which are secured double-faced raak-bars 18, projecting toward the pulley, as shown in Fig. 3. The clutch-hub has radial arms 19, the ends of each being cut away te form a rectangular recess 20, the projecting portions 21 being con- These screws are threaded into dovetailed blocks 28, which are set into the adjacent faces of the carriers 23 and arms 19, as shown best in Fig. 1. The parts are so arranged that when the sleeve is thrust inward by means of the lever 15 the rack-bars turn the screws so as te thrust the shoecarriers outward, causing the shoes to make contact with the flange 3 and clutch the same and thereby operate the pulley.

I claim- 1. In a friction-cluteh, in combination with the cylindrical flange, the radial arms, and the carriers werking upon said arms, the removable dovetailed blocks in both carriers and arms, the pair of screws for each carrier threaded into the blocks of the carrier and arm, the pinions upon said screws, the doublefaced rack engaging both pnions, and the frame-guide for each carrier, substantially as and for the purposes set fortl1.

2. In a friction-clutch, in combination with the cylindrical flange 3, the radial arms 19, and the shoe-carriers 23, the side bars 21, and cross-bars 22, upon the arnas 19 serving as guides for said carriers, the removable dovetai1ed blocks in both carriers and arms, the reverse screws threaded in the opposed blocks, the pinions upon said screws and the double raak working between and actuating each pair of pnions, as and for the purposes specified.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM J. FLETCIIER.

Witnesses:

'1. D. l\/IERWIN, MINNIE L. THAUWALD 

